A short walk north of the illuminated Fosse marquee, Chet Walker, choreographer of the Broadway hit, teaches musical-theater classes (a ten-class card is $115) at the Broadway Dance Center to everyone from Saturday Night Fever stars to those who fantasized about being them but ended up in law school instead. "It's a place to release what you can't maybe do in your normal job, but is still a part of your spirit," Walker says. Professionals, celebrities trying to polish their moves -- including regular Brooke Shields -- and novices can choose from 50 different classes per day in all dance disciplines, including ballet, tap, hip-hop (taught by 'N Sync, Britney Spears, and Spice Girls choreographer Darrin Henson), jazz, and musical theater. "It's structured," says Walker, "but you can add so much of yourself and even reinvent who you are."